docs: def dispose(self):
          """Disposes the :py:class:`securityhandlerhelper` object."""
          self._username = None
          self._password = None
          self._org_url = None
          self._proxy_url = None
          self._proxy_port = None
          self._token_url = None
          self._securityHandler = None
          self._valid = None
          self._message = None
  
          del self._username
          del self._password
          del self._org_url
          del self._proxy_url
          del self._proxy_port
          del self._token_url
          del self._securityHandler
          del self._valid
          del self._message